As we can see, the switching between normal state and normal glycolysis state occurs at the O2 level of around 0.01, whereas the switching between the normal state and the coexistence of normal state and cancer glycolysis state occurs at the regulation strength VEFG->SOD of around 1.5 as shown in Figure 7A. Above the O2 level of around 0.01, the system is dominated with the normal state, whereas below the O2 level of around 0.01, the system is dominated with the normal glycolysis state. This evidence concerns the gene SOD1 and cancer.